Odin,
I think you're correct in a general case, but in this case Future lists it
as MSL1/3 but Microchip lists it as 3... I can't find any Microchip docs
listing it as 1/3. Perhaps they previously classified it as MSL1/3 and have
since changed it to 3.

t

On Tue, Jul 10, 2018 at 12:04 PM, Stadem, Richard D <
[log in to unmask]> wrote:

> It is NOT an error.
> The component manufacturers simply had an original classification for
> handling based on a leaded process (MSL-1), where the parts were reflow
> soldered and reworked using Sn63 solder profiles prior to RoHS.
> Because there were so many parts that were qualified per IPC-020 as MSL-1
> out in the market when RoHS was incorporated, the component manufacturers
> and distributors had no way of going back to re-mark the original part
> packaging to MSL-3 or higher if unleaded solder and its corresponding
> hotter profiles were used. So they simply updated their part prints from
> MSL-1 to MSL-1/MSL-3, with the understanding that the user would handle the
> parts as a level 3 if they were going to go through the hotter lead-free
> processing.
> In other words, the parts would be fine if leaded (max reflow temp around
> 220C) was used, but special precautions to keep the parts dry (MSL-3) were
> required at the hotter profiles.
> Also, some component manufacturers upgraded their components so they could
> withstand the hotter processing temperatures, but they did not want to pass
> on those Level 3 requirements to users who intended to process using leaded
> temperatures, so they called them MSL-1/MSL-3, thus allowing no special
> handling for those who were going to solder with a leaded process.
> Odin
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Tom Brendlinger
> Sent: Tuesday, July 10, 2018 10:42 AM
> To: [log in to unmask]
> Subject: Re: [TN] MSL Rating question on Microchip device...
>
> Hi Steve,
> I think that 1/3 is an error. Microchip only defines their criteria for
> MSL-1 and MSL-3:
> https://www.microchip.com/wwwproducts/Rohs/
>
> This report lists pretty much all of their QFPs as being MSL-3:
> http://ww1.microchip.com/downloads/en/EnvironmentalInformation/
> Package%20Qualification%20Summary%20report%205_15_18.pdf
>
> T
>
> On Tue, Jul 10, 2018 at 11:05 AM, Steve Gregory <[log in to unmask]>
> wrote:
>
> > Hi All,
> >
> > I just ran across something that was brought to my attention about the
> MSL
> > rating for a Microchip TQFP80 part, PN# PIC24FJ256GA108-I/PT
> > <https://analytics.supplyframe.com/trackingservlet/track/?r=
> > gPVv3S5fz9WS0muSSENj7rO6t8VXvQgK1rcMoyYTG0FvQlD0DIEzVjQKFnEX
> > zjwd-qWoH4WrGz915jp9zrn-G-x_qSIVtc8zbLug-SAwCiq0p74rp1VjbJ2KwYhfTKtPqXx
> > cTKsKZYCGGxofwy72prM2kZSCtGHPF0yQzQAytU_QVib44Cu-IBWW40DIyeoDrEQTNcmOi-
> > iuSYSbwoo9uOWkwMsYOgLpgGtKwmlenCQ2qMUd-IluZU4hJMiMAwmQlvALZwlfnfe9p0y
> > 3-ada-0yro_rIN4ri1yG9W-ZAXgWcwuQI3v44ByozahmNdDu-
> > pP83qBz7C1LvOj23z4u80ql5EFxO_M1uaNi8HamPkYIv5nst4jWzwTx9kLe
> > 371AdpR1Zade37d-Lbj994RtcoMlt-_tywF_Sm-fI_q-
> cK0pdzb47WLG3M1qI1PK3dWAQdVdSo
> > ATlHSFiOVsTCt_saqPqKUpH5GxSz0S4qHYNHBJVeAvg0srqjam2tMTKtH_4ep6RpxaZMva-
> > 9pU_Ey3iAJVT9HvW2kqUcoDZQO-bB3n0i_E50WvzT7FtGb8AY1fX6J8wP7q1t6XJ
> > 9Y4gX2enmlUGVq5roSzf_LM_4qzxpZ1mlezG7b5aZxH2oGmw_vefrS7sZbKNHTFjh_
> > Gdgyz4FHrdsp4ysX9vdVTIZyEMa-IrUGN_7E6JEROsA7dEt5NZikg5mrq17ntQe8
> > y7r5_MjRGjrWr9d7d57c8NJ-HE_WJMCK9KvwQMbI2rzs_fn0ogzAshEeM8su_nJNSXQoJ6-
> > WVWH9LR26AGY4y0d3PuCaOSBGsxFFiaSHOaBnl8Zc4tVZjXxT68gr9bJ8R3-
> > PsNm7SjxGiIymxAijZ7Qb4quJc>
> > the part came in from Future and they put a MSL1 label on it and the
> > package wasn't sealed. One of our more knowledgeable technicians wanted
> to
> > double check the rating because he knows that QFP's are normally MSL3 or
> > higher. The Digikey page calls this a MSL3 part, but if you go to Avnet's
> > page it gives this a 1/3 MSL rating...what is that? I have never heard
> of a
> > 1/3 MSL rating. I have also looked at the 305-page datasheet and can't
> find
> > a MSL rating in the Microchip documentation. Has anybody ever seen this
> > before?
> >
> > Steve
> >
> > --
> > Steve Gregory
> > Kimco Design and Manufacturing
> > Process Engineer
> > (208) 322-0500 Ext. -3133
> >
> > --
> >
> >
> >
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